leirmann



(N0 Model.)

G. W. LEIRMANN.

SWIVEL 500K.

No. 267,089. 'Patented Novi 7, 1882.

' Inventor r ttorney.

PETERS, mwumgmpher, wminglm u. c,

UNITED STATES ferritin.

'PATENT GEORGE W. LEIRMANN, OF BUFFALO, NEW YORK, ASSIGNOR OF ONE-HALFTO TIMOTHY GINGRAS, OF SAME PLACE.

SWIVEL-HOOK.

SPECIFICATION forming part of vLetters Patent No. 267,089, datedNovember 7, 1882.

A Application filedMay 25, 1882. (No model.) I

To all 'whom tt 'may concern Beit known that I, GEORGE W. LEIRMANN, ofBuffalo, in the county ot' Erie and State ot' New York, have inventedcertain new and useful Improvements on a Swivel Hook; and I do herebydeclare that the following description of my said invention, taken inconnection with the accompanying sheet of' drawings, formsa full, clear,and exact specification, which will enable others skilled in the art towhich it appertains to make and use the same.

This` invention has general reference to pulley-block, boat, and otherhooks; and it consists essentially in the novel combination of -partsand details of construction, as hereinafter lirst fully set forth anddescribed, and then pointed out in the claims.

In the drawings already mentioned, which serve to illustrate my saidinvention more fully, Figure lis a side elevation of a swivel or boat,Ste., hook. Fig. 2 is a longitudinal sectional elevation ofthe same.Fig. 3 is a front elevation. Fig. 4 is a side elevation, and Fig. 5 alongitudinal sectional elevation, of a pulleyblock constructed inaccordance with my said invention.

The object of my present-invention is theproduction ot' a hook for boatand other use that shall disengage its load as soon as the latter meetsan obstruction-as, for instance, in detachingboats from the davits,85e., or in lowering merchandise, 86e., by means ot' a block and tackle;and it consists essentially ofa weighted hook pivoted within abifurcated frame in such manner that unless the hook is depressed onaccount ot' its suspending a load the weight on the hook will cause itto disengage therefrom, substantially as hereinafter fully set forth anddescribed.

A indicates a bifurcated frame, composed ot' the two parallel members AA, having on or ratherjoining on their upper end ahead, a, said sidepieces, A A, being' provided centrally with bosses B B', for thereception ot a mandrel or axle, C. Upon this axle is journaled ahook,G,having'on one endasphericalor other counterpoise, H, provided with aneye or ring, I, andon its opposite end the usual hook proper, F. In theface ot' the side pieces, A A, are indents E, arranged in such mannerthat whe-n the apparatus is in the condition illustrated in Figs. 2 and3 these indents, together with the seinicircular contour ot' the hook F,form a circular aperture for the reception ot' a ring, rope, or othermeans by which a load is to be elevated or lowered.

In the head a is provided a swivel, J, having a collar,J, a shank, K,anda bearing-collar, K', said swivel being formed entire inany one otthe well-known processes ot' casting in mallea- 6o' ble iron or steel orforging, and it is cast within the head of the frame in the followingmanner: A pattern ot' the desired size, 85o., having been procured, thesame is molded in the sand, and a tinished swivel, J, placed in themold, it having previously been heavily coated with the usualsubstances` to prevent adhesion. Now, the metal is poured and a completeframe cast, having the shank K and collar K embedded in the head a. 7o

In this manner a very cheap, durable, and serviceable swivel-hook isproduced, which,it` cast in steel, is far superior to any forged articleas now manufactured.

As applied to a pulley-block, L, having the sheaves M, my presentinvention is fully illustrated in Figs. 4 and 5, so that I need notenter into the details of construction, which will be readily understoodwithout further explanation.

In operation aload is upheld by the pivoted hook as long as the samedoes not meet an obstruction capable of sustaining said load-as, forinstance, in lowering a boat from thedavits, where the boat is providedwith rings on the bow and stern, which rings are engaged by theswivel-hook shown in Figs. l, 2, and 3. As soon as the boat strikes thewater the hooks G will disengage thering on account of the counterpoisesH, and thereby liberate the boat.

To prevent swamping, aline may be run from the eyes I, which as long asit is pulled may prevent the hook from unlocking. For other purposesthan boat-detaching an aperture,f, in the endg of said hook, and a pin,&c.,f, inserted into said aperture, will prevent the hook fromunlocking, unless said pin, Ste., is first withdrawn from said aperture.This part of my device may, however, be modified invariousmannerswithoutdepartingessentiallyfrom :on my invention. y

Having thus fully described my invention, I

'hook being pivoted between the parallel inembers A A" rof said frame,and constructed to operate in conjunction with the said indentations Ein said frame, substantially in the munner as and for the object stated.

2. The improvement in detachng-hooks,

substantially as described, consisting essentially in the combination,with an O-shaped frame having` in its lower parts seniicircular indentsE, of a hook, F, having on one end the curved part or hook proper,forming in conjunction with said semicircular indents E :Lsubstantially-circular aperture for the reception of a ring, ne., and onits opposite end a counter-Weight, H, said curved part g being providedwith an aperture, f, for the reception of a locking-mmf', and the Wholeconstructed for operation substantially in the manner as and for the useand purpose specified.

In testimony thatl'claim the foregoing as my invention I have hereto setmy hand in the presence of two subscribing witnesses.

. Y GEO. W. LEIRMANN.

YVitness:

MICHAEL J. STARK, JOHN O. DUERR.

